CCNA Routing & Switching 1-4 EXAM PREP

Which tasks can be accomplished by using the command history feature? (Choose two.)

• View a list of commands entered in a previous session.

• Recall up to 15 command lines by default.

• Set the command history buffer size.

• Recall previously entered commands.

• Save command lines in a log file for future reference.

Answer explanation

Explanation: The history command allows you to view and reuse previously entered commands stored in the buffer. It is also used to manage the of the buffer.

What is the first action in the boot sequence when a switch is powered on?

• load the default Cisco IOS software

• load boot loader software

• low-level CPU initialization

• load a power-on self-test program

Answer explanation

Explanation: The first action to take place when a switch is powered on is the POST or power-on self-test. POST performs tests on the CPU, memory, and flash in preparation for loading the boot loader.

What must an administrator have in order to reset a lost password on a router?

• a TFTP server

• a crossover cable

• access to another router

• physical access to the router

Answer explanation

Explanation: Console access to the device through a terminal or terminal emulator software on a PC is required for password recovery.

When configuring a switch for SSH access, what other command that is associated with the login local command is required to be entered on the switch?

• enable secret password

• password password

• username username secret secret

• login block-for seconds attempts number within*seconds*

Answer explanation

Explanation: The login local command designates that the local username database is used to authenticate interfaces such as console or vty.

Which command displays information about the auto-MDIX setting for a specific interface?​

• show interfaces

• show controllers

• show processes

• show running-config

Answer explanation

Explanation: To examine the auto-MDIX setting for a specific interface, the show controllers ethernet-controller command with the phy keyword should be used.

If one end of an Ethernet connection is configured for full duplex and the other end of the connection is configured for half duplex, where would late collisions be observed?

• on both ends of the connection

• on the full-duplex end of the connection

• only on serial interfaces

• on the half-duplex end of the connection

Answer explanation

Explanation: Full-duplex communications do not produce collisions. However, collisions often occur in half-duplex operations. When a connection has two different duplex configurations, the half-duplex end will experience late collisions. Collisions are found on Ethernet networks. Serial interfaces use technologies other than Ethernet.

Which command is used to set the BOOT environment variable that defines where to find the IOS image file on a switch?

• config-register

• boot loader

• boot system

• confreg

Answer explanation

Explanation: The boot system command is used to set the BOOT environment variable. The config-register and confreg commands are used to set the configuration register. The boot loader command supports commands to format the flash file system, reinstall the operating system software, and recover from a lost or forgotten password.

What does a switch use to locate and load the IOS image?

• BOOT environment variable

• IOS image file

• POST

• startup-config

• NVRAM

Answer explanation

Explanation: The BOOT environment variable contains the information about where to find the IOS image file.

Which protocol adds security to remote connections?

• FTP

• HTTP

• NetBEUI

• POP

• SSH

Answer explanation

Explanation: SSH allows a technician to securely connect to a remote network device for monitoring and troubleshooting. HTTP establishes web page requests. FTP manages file transfer. NetBEUI is not routed on the Internet. POP downloads email messages from email servers.

10. What is a characteristic of an IPv4 loopback interface on a Cisco IOS router?​

• The no shutdown command is required to place this interface in an UP state

• It is a logical interface internal to the router

• Only one loopback interface can be enabled on a router

• It is assigned to a physical port and can be connected to other devices

Answer explanation

Explanation: The loopback interface is a logical interface internal to the router and is automatically placed in an UP state, as long as the router is functioning. It is not assigned to a physical port and can therefore never be connected to any other device. Multiple loopback interfaces can be enabled on a router.